/*
 * Copyright 1999-2012 Alibaba Group.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
/**
 * 
 * (created at 2011-1-20)
 */
package fm.liu.timo.parser.ast.expression.type;

import java.util.Map;
import fm.liu.timo.parser.ast.expression.AbstractExpression;
import fm.liu.timo.parser.ast.expression.Expression;
import fm.liu.timo.parser.visitor.Visitor;

/**
 * <code>higherExpr 'COLLATE' collateName</code>
 * 
 * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
 */
public class CollateExpression extends AbstractExpression {
    private final String     collateName;
    private final Expression string;

    public CollateExpression(Expression string, String collateName) {
        if (collateName == null)
            throw new IllegalArgumentException("collateName is null");
        this.string = string;
        this.collateName = collateName;
    }

    public String getCollateName() {
        return collateName;
    }

    public Expression getString() {
        return string;
    }

    @Override
    public int getPrecedence() {
        return PRECEDENCE_COLLATE;
    }

    @Override
    public Object evaluationInternal(Map<? extends Object, ? extends Object> parameters) {
        return string.evaluation(parameters);
    }

    @Override
    public void accept(Visitor visitor) {
        visitor.visit(this);
    }
}
